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Effects of high-molecular weight levan (HL, 6,000 kDa) and low-molecular weight levan (LL, 700 kDa), alone andin combination with phytic acid (PA), on the gastrointestinal physiology of rats were examined. Levan, β-2,6-linked fructosepolymer, is found in plants and by-products of microorganism with widely differing sizes. Male SD rats were randomlydivided into five groups and fed control diet, diet containing 10% HL, 10% LL, 10% HL+1% PA or 10% LL+1% PA for 3weeks. Intake of levans regardless of molecular weight significantly increased cecum content weight by four- to five fold andcecal wall weight by two fold, which were slightly decreased by PA intake. Higher acidification of cecal pH and enhancementof cecal total short-chain fatty acid production in LL group increased divalent cation absorption compared to HL group.Addition of PA to levan diet reduced intestinal fermentation of levans in rats. These results demonstrate LL has higherprebiotic properties than HL.